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Related Concept Videos

Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
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Updated: Jun 14, 2026

Methods for the Self-integration of Megamolecular Biopolymers on the Drying Air-LC Interface
07:06

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Published on: April 7, 2017

Stress fluctuations in drying polymer dispersions.

Alexander M König1, Diethelm Johannsmann

  • 1Institute of Physical Chemistry, Clausthal University of Technology, Arnold-Sommerfeld-Str. 4, D-38678 Clausthal-Zellerfeld, Germany.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 20, 2010
PubMed
Summary

Drying polymer films exhibit stress fluctuations due to environmental humidity changes, not particle network reorganization. These findings are crucial for understanding and modeling crack formation in polymer films.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Physical Chemistry

Background:

  • Drying polymer dispersions induces tensile stress, leading to heterogeneous stress distribution and potential cracking.
  • Edge-in drying and substrate interactions contribute to complex stress profiles in polymer films.

Purpose of the Study:

  • To investigate the nature and origin of stress fluctuations during polymer film drying.
  • To elucidate the role of environmental factors in stress development and crack initiation.

Main Methods:

  • Utilized membrane bending technique for spatially resolved stress mapping.
  • Conducted experiments under varying environmental humidity conditions and controlled airflow.

Main Results:

  • Observed coherent stress fluctuations (approx. 10%) on a few-second timescale across the drying front.
  • Identified ambient humidity variations as the cause of fluctuations, confirmed by experiments with and without a lid, and directed airflow.
  • Modeled stresses based on capillary pressure at particle interfaces, linked to humidity-driven changes in the radius of curvature via the Kelvin equation.

Conclusions:

  • Environmental humidity fluctuations are a primary driver of stress variations in drying polymer films.
  • These humidity-induced stress fluctuations significantly impact film formation and crack propagation.
  • Current film formation models should incorporate these dynamic stress fluctuations for improved accuracy.